JSON.stringify()

The JSON.stringify() static method converts a JavaScript value to a JSON string, optionally replacing values if a replacer function is specified or optionally including only the specified properties if a replacer array is specified.

JSON.stringify() converts a value to the JSON notation that the value represents. Values are stringified in the following manner:

Boolean, Number, String, and BigInt (obtainable via Object()) objects are converted to the corresponding primitive values during stringification, in accordance with the traditional conversion semantics. Symbol objects (obtainable via Object()) are treated as plain objects. Attempting to serialize BigInt values will throw. However, if the BigInt has a toJSON() method (through monkey patching: BigInt.prototype.toJSON = …), that method can provide the serialization result. This constraint ensures that a proper serialization (and, very likely, its accompanying deserialization) behavior is always explicitly provided by the user. undefined, Function, and Symbol values are not valid JSON values. If any such values are encountered during conversion, they are either omitted (when found in an object) or changed to null (when found in an array). JSON.stringify() can return undefined when passing in “pure” values like JSON.stringify(() => {}) or JSON.stringify(undefined).

Syntax example: JSON.stringify(value)